Rock Identifier

Category

Sedimentary (Alluvial Deposit)

Browse sedimentary (alluvial deposit) specimens identified by the Rock Identifier community.

Learn about Sedimentary (Alluvial Deposit) in the encyclopedia

Turbidite

Sapropel

Rock Gypsum

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Corundum (Sapphire in Matrix) (Aluminum Oxide (Al2O3)) — mineral

Corundum (Sapphire in Matrix)

Aluminum Oxide (Al2O3)

Spinel (Magnesium aluminum oxide (MgAl2O4)) — gemstone

Spinel

Magnesium aluminum oxide (MgAl2O4)

Ruby (varieties of Corundum) (Aluminum oxide (Al2O3) with Chromium traces) — mineral

Ruby (varieties of Corundum)

Aluminum oxide (Al2O3) with Chromium traces

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Rounded reddish sandstone pebble (Quartz-rich sandstone, likely ferruginous arkose or litharenite) — sedimentary

Rounded reddish sandstone pebble

Quartz-rich sandstone, likely ferruginous arkose or litharenite

Diamond (Diamond (pure Carbon, C)) — mineral

Diamond

Diamond (pure Carbon, C)

Diamond (Carbon (C)) — gemstone

Diamond

Carbon (C)

Diamond (Carbon (C)) — gemstone

Diamond

Carbon (C)

Peridot (Olivine ((Mg, Fe)2SiO4)) — gemstone

Peridot

Olivine ((Mg, Fe)2SiO4)

Diamond (Diamond (C)) — mineral

Diamond

Diamond (C)

Diamond (in Jewelry) (Carbon (C)) — mineral

Diamond (in Jewelry)

Carbon (C)

Yellow chalcedony (likely citrine or iron-stained quartz) (Microcrystalline quartz, SiO₂; yellow coloration likely from iron oxides or included quartz varieties) — mineral

Yellow chalcedony (likely citrine or iron-stained quartz)

Microcrystalline quartz, SiO₂; yellow coloration likely from iron oxides or included quartz varieties

Assorted polished river pebbles (Mixed lithologies, likely quartzite, chert, jasper, and weathered igneous/metamorphic rocks) — sedimentary

Assorted polished river pebbles

Mixed lithologies, likely quartzite, chert, jasper, and weathered igneous/metamorphic rocks

Weathered sandstone or arkose pebble (Quartz-rich siliciclastic sandstone; likely arkose if feldspar-rich) — sedimentary

Weathered sandstone or arkose pebble

Quartz-rich siliciclastic sandstone; likely arkose if feldspar-rich

Yellow Jasper (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Yellow Quartzite Pitting Pebble (Metamorphic Quartzite (SiO2)) — metamorphic

Yellow Quartzite Pitting Pebble

Metamorphic Quartzite (SiO2)

Jasper Conglomerate (Puddingstone) (Jasper Conglomerate (Siliceous Sedimentary Rock)) — sedimentary

Jasper Conglomerate (Puddingstone)

Jasper Conglomerate (Siliceous Sedimentary Rock)

Copper Nugget (Native Copper (Cu)) — mineral

Copper Nugget

Native Copper (Cu)

Sandstone (likely Quartzose Sandstone) (Arenite (primarily SiO2)) — sedimentary

Sandstone (likely Quartzose Sandstone)

Arenite (primarily SiO2)

Arkosic Sandstone (Arkose (Clastic Sedimentary Rock)) — sedimentary

Arkosic Sandstone

Arkose (Clastic Sedimentary Rock)

Milky Quartz Pebble with Iron Inclusions (Silicon Dioxide (SiO2) with iron oxide impurities) — sedimentary

Milky Quartz Pebble with Iron Inclusions

Silicon Dioxide (SiO2) with iron oxide impurities

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Diamond (Diamond (Pure Carbon, C)) — mineral

Diamond

Diamond (Pure Carbon, C)

Diamond (faceted) (Diamond (Pure Carbon, C)) — mineral

Diamond (faceted)

Diamond (Pure Carbon, C)

Quartz vein fragments on Sandstone cobble (SiO2 (Silicon Dioxide)) — mineral

Quartz vein fragments on Sandstone cobble

SiO2 (Silicon Dioxide)

Quartz Vein in Host Rock (clastic sediment) (Silicon Dioxide (SiO2) in matrix) — sedimentary

Quartz Vein in Host Rock (clastic sediment)

Silicon Dioxide (SiO2) in matrix

Polymictic conglomerate or breccia (possibly concrete-like aggregate) (Lithified polymictic gravel; clasts may include basalt, granite, quartzite, and other silicates) — sedimentary

Polymictic conglomerate or breccia (possibly concrete-like aggregate)

Lithified polymictic gravel; clasts may include basalt, granite, quartzite, and other silicates

Chalcedony Agate Geode / Nodule (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — mineral

Chalcedony Agate Geode / Nodule

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Banded Chert (Jasper) (Silicon Dioxide (SiO2)) — sedimentary

Banded Chert (Jasper)

Silicon Dioxide (SiO2)

Polymict conglomerate (Clastic conglomerate, likely polymictic pebble conglomerate) — sedimentary

Polymict conglomerate

Clastic conglomerate, likely polymictic pebble conglomerate

River Cobble (Quartzite or Weathered Sandstone) (Arenite / Metasandstone (SiO2)) — sedimentary

River Cobble (Quartzite or Weathered Sandstone)

Arenite / Metasandstone (SiO2)

Water-worn sandstone pebble (Quartz-rich sandstone (likely arkosic or ferruginous sandstone)) — sedimentary

Water-worn sandstone pebble

Quartz-rich sandstone (likely arkosic or ferruginous sandstone)

Gravel and Pebbles (Unconsolidated rock fragments / detrital sediment) — sedimentary

Gravel and Pebbles

Unconsolidated rock fragments / detrital sediment

Conglomerate (Clastic sedimentary rock (Conglomerate)) — sedimentary

Conglomerate

Clastic sedimentary rock (Conglomerate)

Red cabochon gemstone, likely carnelian (Carnelian: orange-red chalcedony, microcrystalline quartz (SiO₂)) — gemstone

Red cabochon gemstone, likely carnelian

Carnelian: orange-red chalcedony, microcrystalline quartz (SiO₂)

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Sapphire (Blue) (Corundum (Al2O3)) — mineral

Sapphire (Blue)

Corundum (Al2O3)

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Rough Green Sapphire (Corundum) (Corundum (Al2O3 - Aluminum Oxide with trace elements)) — mineral

Rough Green Sapphire (Corundum)

Corundum (Al2O3 - Aluminum Oxide with trace elements)

Ruby (Corundum (Al2O3 with Chromium impurities)) — mineral

Ruby

Corundum (Al2O3 with Chromium impurities)